foo.cc:36:5: error: redefinition of 'int main()'
   36 | int main(){
      |     ^~~~
foo.cc:2:5: note: 'int main()' previously defined here
    2 | int main()
      |     ^~~~
foo.cc: In function 'int main()':
foo.cc:6:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    6 |  scanf("%d %d",&n,&k);
      |  ~~~~~^~~~~~~~~~~~~~~
foo.cc:8:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    8 |   scanf("%d",&a[i]);
      |   ~~~~~^~~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:39:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   39 |  scanf("%d %d",&n,&k);
      |  ~~~~~^~~~~~~~~~~~~~~
foo.cc:41:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   41 |   scanf("%d",&a[i]);
      |   ~~~~~^~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务